RESPONDENT EXCEEDED THE STANDARD FOR OPACITY AT THE CLINKER COOLER KILN. GCC DACOTAH VIOLATED CERTAIN PROVISIONS OF THE PORTLAND CEMENT MACT SUBPART LLL. AT TIME BETWEEN MARCH 2007 AND MAY 2009 GCC EXCEEDED OPACITY AND TEMPERATURE LIMITS. ADDITIONALLY, AT VARIOUS TIMES BETWEEN MACH 2007 AND NOVEMBER 2008, GCC FAILED TO CONDUCT AND/OR MONITOR OR DAILY VISUAL EMISSIONS TESTS OR OBSERVATIONS.